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Could you help me find issue in sensor circuit?

embeddedguy

I have designed a sensor with magnetometer and pressure sensor(ICP20100). After ordering the PCB and having done initial test, I could not find the ICP20100 on I2C bus(Address=0x63) while the other sensor is showing on the I2C bus.

Could you help me find the issue in my circuit diagram(Screenshot below)? as this could be the likely source of issue with the PCB. 

Note: As per the datasheet the CSB pin need to be high for I2C to active, hence I have removed the 10k resistor and short the pins.

The issue could be the capacitors C8/9 which needs to be low ESR as per datasheet. I ignored it because it was hard to find a caps which have this parameter listed in datasheet. So I used capacitors with same value and tolarances.

image

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  • This might be a minor thing, but in looking at your schematic, there is only a single RESV pin (with no pin number), while the PDF specification shows two RESV pins (pin 8 and 9).  Maybe the the linked schematic  (by ) is for a different version of this chip, but I would double check this part of the schematic and the library package for the ICP-20100.

    Also, the section of the schematic that you have included does not show all the power routing. Are all of the I2C chips being powered at 3.3V? With I2C being an open collector interface there should not be too much of an issue, unless some of the I2C devices are powered at higher voltages, then they might have logic level issues and not see logic high levels.

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  • This might be a minor thing, but in looking at your schematic, there is only a single RESV pin (with no pin number), while the PDF specification shows two RESV pins (pin 8 and 9).  Maybe the the linked schematic  (by ) is for a different version of this chip, but I would double check this part of the schematic and the library package for the ICP-20100.

    Also, the section of the schematic that you have included does not show all the power routing. Are all of the I2C chips being powered at 3.3V? With I2C being an open collector interface there should not be too much of an issue, unless some of the I2C devices are powered at higher voltages, then they might have logic level issues and not see logic high levels.

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